1. Check whether the signal is stable. It is recommended to shut down and restart the network, and then try again.
2. Please check whether the mobile data restriction function is set. Mode: Settings-Traffic Monitoring-Setting Traffic Usage Limit-Restricting Traffic Usage-Off (different models of mobile phones may operate in slightly different ways).
3. Please change the other location or try at another time.
4. Try to replace another SIM card.
5. If the mobile data is still disconnected from the Internet for no reason, it is recommended to connect to the wireless network to update the version of the mobile phone system. Note: Please back up the data in the device before upgrading.
6. If it is the latest version, please back up the data (contacts, information, photos, etc. ) and then try to restore the factory settings.
If the problem still exists, please take the purchase invoice, maintenance card and machine to the Samsung service center, and the professional after-sales engineer will help you test it.
If the phone is often disconnected due to weak or unstable WIFI signal, it is suggested that:
1. Check whether the signals of other devices connected to the wireless network are good or complete.
2. Check whether there are many devices connected to the wireless network.
3. Restart the phone and search for the WiFi signal again.
4. If it is a home router, it is recommended to disconnect the power supply for a period of time and try again.
5. If you use the wireless network of the network operator, it is recommended to try to change the location.
6. Try to change another wireless network.
7. Back up the data in the machine (such as contacts, short messages, multimedia, etc.). ), and then restore the factory settings.
If the problem still exists after the above operation, please take the purchase invoice, maintenance card and machine to Samsung service center for inspection.